JPS6233532Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for adjusting the horizontal feed pitch of a seedling stand in a rice transplanter.

In general, the horizontal feeding device of the seedling stand changes and adjusts the horizontal feeding pitch in order to adjust the amount of scraping by the planting rod of the seedling block equivalent to one seedling, depending on the growing state and density of the seedlings. However, due to the relationship between vertical feeding and the timing of scraping pine seedlings, it is necessary to adjust the horizontal feeding pitch at a common dividing point before and after the adjustment, that is, at the end of the horizontal movement of the seedling tray. be. However, in the past, adjustments were made by replacing a pair of sprockets or gears with ones with different reduction ratios, but it was difficult to precisely match the alignment marks for timing, which made the work extremely troublesome. It was inefficient. Furthermore, as shown in Japanese Utility Model Publication No. 53-46180, a device has been devised in which a restraint device is provided to prevent the cross-feed pitch from being changed or adjusted except when it is located at a common dividing point before and after adjustment. , this device requires restraints, sliding gears, shift forks, etc., making the transmission part of the planting part complicated and space-constrained, and mechanically,
When sliding the sliding gear, there is an idling range, that is, a neutral state in which the gear does not mesh with any gear, and there is a possibility that the timing may be deviated based on the neutral state.

Therefore, the present invention makes the least common multiple of the gear ratios of each transmission body in the transmission device coincide with the common division point of the number of seedling divisions, enables speed change operation only at the common division point, and further rotates each transmission body around the transmission shaft. In addition to freely supporting the transmission shaft, an engagement piece that engages with a key groove of any one of the transmission bodies is fixed to the transmission shaft, so that the transmission shaft is used as a transmission operation shaft and also as a power transmission shaft. Therefore, it is an object of the present invention to provide a transverse feeding device for a seedling stand in a rice transplanter that eliminates the above-mentioned drawbacks.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in Fig. 1, the planting section 2 of the rice transplanter is
The main body case 5 is supported by a link 3 to a traveling body (not shown) so as to be able to rise and fall freely, and the main body case 5 supports a seedling stand 6 on its upper part so as to be slidable in the horizontal direction. At the same time, there is a float 7 at the bottom.
is swingably suspended. The main body case 5 rotatably supports the same number of planting rods 9 as the number of planting rows, and is connected to a seedling stand transverse feed device 10. Furthermore, within the main body case 5, these planting rods 9 A power transmission device for transmitting power to the transverse feed device 10 is built-in. That is, the second
As shown in the figure, input 1 from the traveling aircraft is gear 1
The power is transmitted to the planting rod 9 through the chain 12, etc., and is further transmitted to the input shaft 1 of the transverse feed device 10 through the chain 12, etc.
Power is transmitted to 3. In addition, the lateral feed device 10
A traverse cam 15 made of a Napier screw is rotatably supported by the main body case 5, and a piece 16 is engaged with the cam 15. Furthermore, the top 16 is held by a support block 17, and the block 17 is connected to a slide bar 19 that is slidably supported by the case 5, and the bar 19 is connected to the outside of the case 5 via a bracket. and is connected to a seedling stand 6. Also,
One end of the traverse cam 15 protrudes from the main body case 5, and three sprockets 20, 21, 22 having different numbers of teeth are non-rotatably supported on the camshaft 15a of the protruding portion. On the other hand, a vertical feed cam 23 is fixed to the input shaft 13, and a sleeve 13a is fixed to the end of the input shaft so as to protrude outward from the case 5. A speed change shaft 25 is connected to the sleeve 13a in a relatively non-rotatable but slidable manner by a flat portion, etc., and three sprockets 26, 27, 28 having different numbers of teeth are rotatably supported on the speed change shaft 25. has been done. Further, a round bar-shaped pin 2 constituting an engagement piece is provided at an appropriate location on the speed change shaft 25.
9 is fixed with only one end thereof protruding from the outer periphery of the transmission shaft 25, and as shown in detail in FIG. Possible keyway 26a, 2
7a and 28a are each formed at one predetermined location. Furthermore, each sprocket 20, 26, 21 supported by the cast shaft 15a and the speed change shaft 25
and 27, and chain 3 between 22 and 28, respectively.
1, 32, and 33 are wound around each other, and these sprockets and chains constitute a constantly meshing type transmission 34, and the transmission 34 is covered by a transmission case 35. Furthermore, the transmission case 35 has a boss portion 35a that guides the transmission shaft 25.
is formed in a protruding manner, and three circumferential grooves 36, 37, and 38 are formed in the boss portion of the speed change shaft 25. As shown in FIGS. 4 and 5, one through hole 41 is bored in the boss portion 35a so as to extend in the tangential direction of the circumferential grooves 36 to 38. The snap pin 42 can pass through so as to engage any one of the circumferential grooves. Furthermore, a knob 43 is rotatably supported at the end of the speed change shaft 25, and the speed change shaft 25 can be slid and operated safely regardless of the rotation of the speed change shaft 25. The sprockets 26 to 28 on the speed change shaft 25 correspond to the sprockets 20 to 21 and chains 31 to 33 on the camshaft 15a, respectively.
The keyways 26 of these sprockets 26 to 28 are constantly rotating while maintaining a predetermined relationship with each other through
The position where a to 28a are lined up in a straight line, that is, the least common multiple of the rotational speed of each sprocket 26 to 28 is the common dividing point before and after adjustment, that is, the horizontal movement end of the seedling stand 6 (including the center position in some cases) ) is set to match.

Since this embodiment has the above configuration, power is transmitted to the planting rod 9 via the power transmission device 11 in the main body case 5, and the predetermined trajectory a of the planting rod 9 is
At the same time, power is also transmitted to the input shaft 13 of the transverse feeding device 10 for the seedling table. Then, the rotation of the input shaft 13 is transferred to the speed change shaft 2 through the sleeve 13a.
5, and a pin 29 constituting an engaging piece is connected to the key grooves 26a to 27 of each sprocket 26 to 27.
By engagement of any one of a, the transmission is transmitted to a suitable sprocket, for example, the small sprocket 26 as shown in the figure. The rotation of the sprocket 26a is decelerated through the chain 31 and the sprocket 20 and transmitted to the camshaft 15a, thereby rotating the traverse cam 15 at a low speed. Then, the cam 1
The top 16 and support block 17 engaged with 5
The slide bar 19 is moved laterally in small pitches, and the seedling stand 6 is also moved laterally in small pitches, for example, divided into 26 sections.

To adjust the horizontal feed pitch of the seedling stand 6, the snap pin 42 is removed from the through hole 41, and the speed change shaft 25 is brought into a state where it can be slid. In this state, when the knob 43 is grasped and biased in the direction of pulling the speed change shaft 25, each sprocket 2 is
The key grooves 26a and 27a of the pins 6 and 27 do not match, and the speed change shaft 25 does not move. However, when the seedling stand 6 reaches the end of the traverse movement and the key grooves 26a and 27a match, the pin 29 is quickly moved. is from the keyway 26a to 2
7a (in some cases, move to keyway 28)
move to a). Further, in this state, by inserting the snap pin 42 into the through hole 41, the snap pin 42 is engaged with the circumferential groove 37, and the shift shaft 2
5 in this position. As a result, the rotational axis of the speed change shaft 25 is transmitted to the middle sprocket 27 via the pin 29, and further transmitted to the camshaft 15a via the chain 32 and sprocket 21, which rotates the traverse cam 15 at a medium speed and loads the seedlings. The table 6 is moved horizontally by intermediate pitches, for example, divided into 20 sections.

In the above embodiment, the speed was changed using a chain and a sprocket, but other transmission bodies such as gears may also be used.
Of course, it may be provided on the side.

As explained above, according to the present invention, the speed change shaft 25 not only transmits power but also works as a speed change shifter shaft by sliding, so the structure is simple, lightweight, and compact, and does not have a complicated structure and requires less space. It can be easily incorporated into a transmission part of a planting section without a seedling tray, and the entire transmission part of the seedling platform traversing device 10 can be made compact and lightweight. In particular, since the traverse cam 15 is disposed in the center of the seedling platform lateral feeding device 10, the transmission section is disposed at one end. The balance deteriorates and the ability of the planting part 2 to follow the rice field is significantly impaired, but as mentioned above, the weight of the transmission part can be reduced, so the above-mentioned disadvantages do not occur and the structure can be used in a variety of ways without changing the structure. The number of stages can be increased, and the left-right balance is not affected much. Further, the transmission bodies such as the sprockets 26 to 28 are arranged closely to each other, and the key grooves 26a to 26 of these transmission bodies are arranged closely together.
8a is engaged with the engaging piece 29 to change the speed, so there is no idling range at all, and it is possible to prevent the timing before and after the adjustment from shifting. Furthermore, it is possible to adjust the lateral feed pitch of the seedling stand 6, that is, the above-mentioned speed change operation. Since this is possible only at the common dividing point before and after adjustment, the timing of vertical feeding and scraping of pine seedlings does not deviate, and the occurrence of missing or insufficient plants can be prevented.
Further, if a round bar-shaped pin is used as the engagement piece 29, the circular cross section of the pin 29 makes it easy to move to the key grooves 26a to 28a during gear shifting, and the gear shifting operation can be performed smoothly. In the unlikely event that
Even if the pin 29 slightly faces the keyway of another transmission body, the radius of the pin 29 pushes the pin back into the original keyway, ensuring secure engagement.
Furthermore, since the parts do not require much precision, combined with the fact that round bar-shaped pins are inexpensive, manufacturing can be done at low cost.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the planting section of the rice transplanter to which the present invention is applied, Fig. 2 is a sectional view showing the transverse feeding device of the seedling bed, Fig. 3 is a front view showing the transmission device, and Fig. FIG. 4 is a front view showing the snap pin portion, and FIG. 5 is a sectional view showing the speed change shaft portion. 2... Planting section, 6... Seedling stand, 9... Planting rod, 10... Seedling stand lateral feeding device, 13... Input shaft, 15... Traverse cam, 25... Speed change shaft, 26-28 ...Transmission body, 26a to 28a...
Keyway, 29... engaging piece (pin), 34... transmission.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Rotation from the input shaft linked to the planting rod is transmitted via a transmission to a traverse cam that transversely moves the seedling rack, and the number of seedling divisions of the seedling rack is determined by In the transverse feeding device for a seedling bed in a rice transplanter configured to be able to adjust the speed, the transmission device is configured by a plurality of rows of transmission bodies that are constantly connected, and these transmission bodies are rotated relative to the input shaft or the traverse cam. The transmission body is rotatably supported on a transmission shaft that is irrevocably and slidably connected, and each of the transmission bodies is provided with a keyway, and the least common multiple of the transmission ratio of these transmission bodies is set at a common dividing point of the number of seedling divisions. and an engaging piece is fixed to the speed change shaft, and by sliding operation of the speed change shaft, the engaging piece is engaged with any one of the keyways of the transmission body, and the speed change is performed. A lateral feeding device for a seedling stand in a rice transplanter configured to transmit power through a shaft and an engagement piece. (2) A lateral feeding device for a seedling stand in a rice transplanter according to claim 1, wherein the engaging piece is a round bar-shaped pin.